GetCurrentMessage 的作用

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2011-02-14 15:31:36| 分类：小技巧|字号订阅

ON_COMMAND(ID_BLACK, OnColor)

ON_COMMAND(ID_BLUE, OnColor)

ON_COMMAND(ID_GREEN, OnColor)

ON_COMMAND(ID_RED, OnColor)

ON_COMMAND(ID_WHITE, OnColor)

把多个ID映射到同一个函数，在函数里用GetCurrentMessage得到具体消息，分流处理。

UINT m_nIDColor;

m_nIDColor = LOWORD(GetCurrentMessage()->wParam);

// Determines the color being modified

// and then updates the color state

switch(m_nIDColor)

{

case ID_BLACK:

pDoc->ClearAllColors();

pDoc->m_bBlack = !(pDoc->m_bBlack);

break;

case ID_WHITE:

pDoc->ClearAllColors();

pDoc->m_bWhite = !(pDoc->m_bWhite);

break;

case ID_RED:

pDoc->m_bRed = !(pDoc->m_bRed);

pDoc->m_bBlack = FALSE;

pDoc->m_bWhite = FALSE;

break;

case ID_GREEN:

pDoc->m_bGreen = !(pDoc->m_bGreen);

pDoc->m_bBlack = FALSE;

pDoc->m_bWhite = FALSE;

break;

case ID_BLUE:

pDoc->m_bBlue = !(pDoc->m_bBlue);

pDoc->m_bBlack = FALSE;

pDoc->m_bWhite = FALSE;

break;

default:

AfxMessageBox(IDS_UNKCOLOR);

return;

}